Avman
Are you seriously suggesting that after shutting an engine down "shortly" after take-off at LAX, the crew would elect to continue a 10 hour flight on three? If this pans out to be true, that'll be BA off my longhaul prefered carrier list! However, methinks and hopes that it's total bulls##t.
Any carrier with 4 engines will consider doing that, since getting passengers closer to destination is easier logistically, and engineering support is easier closer to home base. You don't have only one remaining to worry about all the way over, but performance is penalised.